Temperature compensation of Wheatstone bridge magnetoresistive sensors based on generalized impedance converter with input reference current

A compensation method of the sensitivity drift of the Wheatstone bridge sensor is proposed. The technique was carried out by placing a temperature sensor and the bridge to be compensated inside a generalized impedance converter with input reference current. No internal modification of the bridge arm...

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Bibliographic Details
Published in:Review of scientific instruments 2006-10, Vol.77 (10)
Main Authors: Ramírez Muñoz, Diego, Sánchez Moreno, J., Casans Berga, Silvia, Castro Montero, Enrique, Reig Escrivà, Càndid, Navarro Antón, A. Edith
Format: Article
Language:English
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Summary:A compensation method of the sensitivity drift of the Wheatstone bridge sensor is proposed. The technique was carried out by placing a temperature sensor and the bridge to be compensated inside a generalized impedance converter with input reference current. No internal modification of the bridge arms is required so that the circuit is capable to compensate practical industrial sensors. The method is based on the temperature modulation of the current supplied to the bridge, which improves previous solutions based on constant current compensation. Experimental results are shown using a commercial magnetoresistive bridge sensor.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.2358696